Olsen, A.

Olsen, A., 1987. Low technology water purification by bentonite clay and moringa oleifera seed flocculation as performed in Sudanese villages: effection schistosoma mansomi cercariae. , pp.p. 517- 522: fig., tab. Available at: https://www.ircwash.org/sites/default/files/253-3934.pdf.